Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
New vehicles	$ 799,600	$ 449,300
Used vehicles	505,700	534,000
Service loaners (1)	172,700	143,800
Parts, accessories and other	100,300	89,700
Inventories	$ 1,578,300	$ 1,216,800